Command Change Air Force Gen. Glen D. VanHerck, incoming commander of the North American Aerospace Defense Command and U.S. Northern Command, accepts the Northcom flag from Defense Secretary Dr. Mark T. Esper, during a change-of-command ceremony at Peterson Air Force Base, Colo., Aug. 20, 2020. VanHerck took command from Air Force Gen. Terrence. J. O’Shaughnessy, who retired after 34 years of military service. SHARE IMAGE: Download Image: Full Size (1.51 MB) Tags: NORAD, Northern Command, Defense Secretary, Esper Photo By: Thomas Paul, DOD VIRIN: 200820-F-NE677-1001A.JPG Photo Gallery